is-finalizationregistry (1.1.1)
Published 2026-02-24 13:58:25 +00:00 by atheaadmin
Installation
registry=npm install is-finalizationregistry@1.1.1"is-finalizationregistry": "1.1.1"About this package
is-finalizationregistry 
Is this value a JS FinalizationRegistry? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Example
var isFinalizationRegistry = require('is-finalizationregistry');
assert(!isFinalizationRegistry(function () {}));
assert(!isFinalizationRegistry(null));
assert(!isFinalizationRegistry(function* () { yield 42; return Infinity; });
assert(!isFinalizationRegistry(Symbol('foo')));
assert(!isFinalizationRegistry(1n));
assert(!isFinalizationRegistry(Object(1n)));
assert(!isFinalizationRegistry(new Set()));
assert(!isFinalizationRegistry(new WeakSet()));
assert(!isFinalizationRegistry(new Map()));
assert(!isFinalizationRegistry(new WeakMap()));
assert(!isFinalizationRegistry(new WeakRef({})));
assert(isFinalizationRegistry(new FinalizationRegistry(function () {})));
class MyFinalizationRegistry extends FinalizationRegistry {}
assert(isFinalizationRegistry(new MyFinalizationRegistry(function () {})));
Tests
Simply clone the repo, npm install, and run npm test
Dependencies
Dependencies
| ID | Version |
|---|---|
| call-bound | ^1.0.3 |
Development Dependencies
| ID | Version |
|---|---|
| @arethetypeswrong/cli | ^0.17.1 |
| @ljharb/eslint-config | ^21.1.1 |
| @ljharb/tsconfig | ^0.2.2 |
| @types/for-each | ^0.3.3 |
| @types/object-inspect | ^1.13.0 |
| @types/tape | ^5.7.0 |
| auto-changelog | ^2.5.0 |
| encoding | ^0.1.13 |
| eslint | =8.8.0 |
| for-each | ^0.3.3 |
| in-publish | ^2.0.1 |
| npmignore | ^0.3.1 |
| nyc | ^10.3.2 |
| object-inspect | ^1.13.3 |
| safe-publish-latest | ^2.0.0 |
| tape | ^5.9.0 |
| typescript | next |
Keywords
weakref
finalization
finalizationregistry
finalization registry